FUNCTION: [Summary is not available for the mouse gene. This summary is for the human ortholog.] The protein encoded by this gene is a nuclear outer membrane protein that binds cytoplasmic F-actin. This binding tethers the nucleus to the cytoskeleton and aids in the maintenance of the structural integrity of the nucleus. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2009] PHENOTYPE: Homozygotes for one knock-out allele show normal myonuclear positioning of both synaptic and non-synaptic nuclei in skeletal muscle cells. Homozygotes for another knock-out allele exhibit a thickened epidermis and altered nuclear envelope architecture inprimary dermal fibroblasts and keratinocytes. Mice homozygous for a spontaneous mutation exhibit early retinal defects in photoreceptors, secondary Neurons, and muller glia. [provided by MGI curators]